- this implementation is based on a more accurate colour emphasis from fceux.
- The raw palette + nes decoder shader was kinda incomplete since the implementation was based on
a per-frame basis which means that the emphasis bits were read once and applied to the whole frame. This
means that some games that uses a per pixel or per scanline emphasis would not appear correct. The more
accurate implementation reads emphasis bits from bits 5-7 of PPU[1] and saves this info in a separate frame.
- The same implementation is also used to fix emphasis for the ntsc filter.
- ines.c - misc cleanups
- Fix Dendy not restored when changing overrides back to auto mode
- directly apply new scanlines and additional scanlines when changing overclock settings
- (readability) change variable name overlock_state to overclock_enabled
mmc5 fix taken from fceux source code to handle correctly the register
$5130 in fceumm. Now we can play games like Legend of Link nes hack that
need this fix.
